Genealogy show unlocks celeb family secrets

If there’s a bigger cheerleader for genealogy research than Henry Louis Gates Jr. it’s unlikely they’re nearly as well-connected.

The prominent Harvard professor once again lures the famous and celebrated to PBS’ “Finding Your Roots,” which shares their ancestry and family stories as uncovered by impressive research and science.

In the fourth season airing now, the three dozen subjects include Scarlett Johansson, Lupita Nyong’o, Sean Combs, Amy Schumer, Garrison Keillor, Aziz Ansari, filmmaker Ava DuVernay, author Ta-Nehisi Coates and Christopher Walken.

Larry David, whom Gates said he’d “bugged” for three years to go under the “Roots” microscope, finally agreed and discovered that he’s related to Bernie Sanders, whom David memorably impersonated on “Saturday Night Live.”

But “Finding Your Roots” is aimed at more than satisfying individual curiosity and telling an engrossing story. It carries a message of shared origins that he argues can benefit society.

The science of DNA proves that “there aren’t four or five biologically distinct races. We’re all from one race, the human race, genetically,” Gates said.

Detailing how different ethnic groups contributed to world history and how their experiences “merged or conflicted” with those of other groups is also of immense value, he said.

“It’s part of a larger education process to make us all realize we’re fully human,” Gates said.

Advances in DNA testing and the increased digitization of records benefited those who participated this year, he said, while some searches required plain old shoe leather as well.

Among the stars with standout stories:

— Carly Simon, who was eager to find out whether her maternal grandmother, who came to the United States from Cuba, had her lineage right: She claimed to be the offspring of the king of Spain and a Moroccan slave. Researchers traveled to Cuba and found “an amazing family tree,” Gates said, one different than expected. Simon’s grandmother was found to be 40 percent black, making the singer-songwriter 10 percent black.

— Tea Leoni asked the show to focus on finding the family of her mother, Emily Patterson, an adoptee who never knew the names of her biological parents. Over a period of months, Patterson’s DNA was run through databases, and a match showed they had a common ancestor. The candidates were narrowed to a pair of sisters, one of whom proved to be Patterson’s mother and who, at 96, was still alive.

— Questlove, the musician born Ahmir Khalib Thompson, found his family has an extraordinary history. In 1860, five decades after the slave trade to the United States was abolished, a ship illegally brought about 110 slaves to Mobile Bay, Alabama, from what is now the Republic of Benin. It was the last known slave ship to arrive in the United States, Gates said. Aboard was a couple who would take the names Charlie and Maggie Lewis and who were recorded on the 1880 census as African-born. As freed people, they settled in an Alabama town largely made up of others on the ship, and Questlove’s distant cousins who live in the area shared with him a photo of Charlie Lewis.